硅粉对低强度再生混凝土抗压强度影响试验研究

Experimental study on effect of silicon powder on compressive strength of low strength recycled concrete

再生混凝土材料是对以往建筑材料使用过程中剩余废料和材料的再利用,具有良好的力学特性,为社会资源的可持续发展与循环利用提供良好的条件。为研究外掺硅粉对低强度再生混凝土抗压强度的影响规律,以硅粉掺量为控制参数,对不同掺量硅粉的再生混凝土进行了无侧限抗压强度试验。试验结果表明:硅粉可以显著改善再生混凝土的力学性能,随硅粉掺量的增加,再生混凝土的抗压强度呈现出递增的趋势。硅粉填充了混凝土内部较大孔隙,引起其孔隙率降低,改善了混凝土的密实度,宏观表现为抗压强度随硅粉掺量的增加而增大。

Recycled concrete material is the reuse of the remaining waste and materials from the use of previous construction materials,which has good mechanical properties and provides good conditions for the sustainable development and recycling of social resources.In order to study the effect law of silica fume on the compressive strength of low-strength recycled concrete,an unconfined compressive strength test was carried out on recycled concrete with different amounts of silica fume as a control parameter.The test results show that silica fume can significantly improve the mechanical properties of recycled concrete,and the compressive strength of recycled concrete shows an increasing trend with the increase of silica fume admixture.Silica fume fills the larger pores inside the concrete,causing its porosity to decrease and improving the compactness of the concrete,and the macroscopic performance is that the compressive strength increases with the increase of the amount of silica fume.